I shoot a similar handload from the open barrel of my O/U (1.25 oz buffered 7.5s). I use a fairly open choke in that barrel for close in birds and limit my shots to 30 yds. The shell will certainly kill to 35 yds with a tighter choke, but 7.5s hit my min penetration level at 35 yds. High brass 6s are only range limited by their pattern density. As far as they will put 100 pellets in a 10" circle, they will reliably kill turkeys. Just shoot some out of your rig and see how they do.